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W. L. BRENNER.

MILLING CUTTER HOLDER.

APPLJATION FILED NOV-18.1918.

1 ,3 1 9,458 Patented Oct. 21., 1919.

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WWW Zzdm I a citizen of the United States, residing at Detroit, county of Wayne, State of Michllrerense.

UNITED STATES PATENT OFFICE.

WILLIAM LUIE'U BRENNER, OF DETROIT, MICHIGAN, ASSIGNOR TO PRODUCTION TOOL C0. AMERICA, OF DETROIT, MICHIGAN, A. CQRPORATION GF MICHIGAN.

MILLING-CUTTER HOLDER.

Specification of Letters Yatent.

Patented Oct. '21, 1919.

Application filed'November 1a, 1918. Serial in; 262,913.

To' all whom it may concern:

Be it known that I, WILLIAM L. BRENNER,

gan, have invented a new and useful Tm provement in Milling-Cutter Holders, of which thefollowing is a specification.

This invention relates to a milling cutter holder and especially a surface milllng cutter holder, and has for" its object an assem bly of the cutters uponthe holder to give a maximum number of effective bearing polnts upon the cutters with a single tlghtening device.

In the drawings,; Figure 1 is anend elevation.

Fig.- 2 is a section on the line 22 of v Fig. 1.

. itself to the three contact points with two Fig. 3 is a side elevationshowing part of the cutters in place and some of the cutter seats unoccupied.

Fig. 4 is a detail of the screw and nut.

tightening device;

Fig. 5 is a detail of the nut.

c designates the body of the holder which comprises a'hulo exteriorly screw-threaded at one end and terminating in an outwardly flaring annular flange b at the opposite, end. This flange is exteriorly slotted to form the cutter seats 0. Reaching annularly around theaflange, and transversely of the seats 0, is a groove (2 which forms a plurality'of seats for the squared portions 6 of the nuts 7". The outer end of the nut is in general con-- formation a triangular rim to form a three point bearing upon two adjacent cutters 9.

Any three points can be made to'define ,a'

plane. Hence these nuts can always find a three pomtbearing upon two cutters regardless of irregularity. The screw bolts h I pass through perforations the flange that are considerably larger "than the shanks of the screw bolt and slightlyiarger than the heads of the screw bolt. Consequently the nut and screw, when not tightened, may wabble slightly to allow the nut to ad ust adjacent cutters.

l The perforations through the flange are countersunk at i to provide shoulders to be engaged by the heads of the screw bolts 7a.

All thesecountersunk portions are in the enlarged center opening formed in the holder by the flaring annular flange 5. Hence all the bolt heads are seated on this slots of the flange and held in and turning them into the nuts f which are held from rotation by the trapeziform seats formed by the annular groove 03. When these screw bolts are turned in to the limit of the power available, the nut bears tightly on two adjoining cutters, two bearing points on one cutter and a third bearing point on the .other cutter substantially equally distant from the two first-mentioned bearing points due to the triangular conformation of the rim of the nut.

With the nuts locked from rotation by the squared seats, there is little likelihood of backing the screw bolt out .of the nut to loosen it, for the nut is the member in contact with the cutters which are directly subject to the stresses.

What I claim is:

Q 1. A milling cutter holder, comprising a body havlng an annular flange provided with cutter seats and perforated, cutters engaging in said seats, screw bolts disposed through said perforationsin the flange with their. heads onthe inside, andnuts on the ends of the screw boltsfor engaging against the cutters to hold them in place.

2. A milling cutter holder, comprising a bodyhaving atone end an annular flange which is perforated and also slotted to form cutter seats, cutters seated in said seats, and screw bolts passing through the perfora tio'ns'and having their heads on the inside of the flange, and nuts each having three point bearlngs on a pair of cutters and engaging the ends of said screw bolts.

3. A milling cutter holder, comprising a body having at one end an annular flange slotted and perforated and provided with an annular grodve intersecting the slots, screw bolts passing through theslots with their heads'on the inside of the flange, nuts having. squared portions that fit intothe nut seats formed bythe annular groove in the flange and having a rim projecting over the squared portions, and cutters seated in theprojecting rims of the nuts.

place bythe at. A milling cutter holder, comprising a body having at one end an outwardly flaring annular flange whlch is perforated,

' slotted and annularly grooved, screw bolts passing through the perforr tions, a nut having a squared portion seated in each nut seat formed by the annular groove and each nut having a projecting rim, and cutters seated in the slots and engaged in pairs by the rim of each single nut.

55. A milling cutter, comprising a body having at one end an annular flange slotted to form cutter seats, annularly grooved to form nut seats, and perforated for the passage of screw bolts, screw bolts loosely located in said perforations, nuts having squared portions fitting into the nut seats and having rim portions which are substantially triangular in conformation to give a three point bearing on two cutters, and cutters located in the cutter seats.

6. A milling cutter holder, comprisin a body having an annular flange with aub portion threaded on. the outside, a ring running on the threads of the hub portion to act as a cutter adjuster, the said annular flange being exteriorly slotted to form cutter slots, cutters engaging in said seats and inside of the flange, and nuts running on the ends of the screw bolts and bearing against the cutters to hold them in their seats.

7 "A milling cutter holder, comprising a body having at one end an annular flange slotted exteriorly and perforated, a plurality of cutters seated in said slots, nuts adapted to have three point bearing contacts with pairs of cutters, and screw bolts engaging in the said slots in the annular flange to force the nuts down into such bearrelations with pairs of cutters.

in I 1111 Witness whereof I have hereunto set my hand on the 12th day of November, 1918.

WILLIAM LUPU BRENNER. 

